Chaetopleura chelazziana Ferreira, 1983

Dell’Angelo, Bruno, Prelle, Giovanni, Sosso, Maurizio & Bonfitto, Antonio, 2011, Intertidal chitons (Mollusca: Polyplacophora) from southern Madagascar, African Invertebrates 52 (1), pp. 21-21 : 30

Chaetopleura chelazziana Ferreira, 1983

Fig. 4H

Chaetopleura chelazziana: Ferreira 1983: 254 , figs 3–10; Dekker & Ceuninck van Capelle 1994: 134;

Dekker & Orlin 2000: 7; Slieker 2000: 46, pl. 11, fig. 6.

Chaetopleura (C.) chelazziana: Kaas & Van Belle 1987: 93 , fig. 41.

Dinoplax fossus (non Sykes, 1899): Kaas 1979: 861 (fide Kaas & Van Belle 1987: 95).

Comparison and remarks: The examined specimens fully agree with descriptions and figures provided by Ferreira (1983) and Kaas & Van Belle (1987). This is the first report of the species from Madagascar.

Type material: Holotype MZUF 4096 ( Museo di Zoologia Università di Firenze ) . Paratypes: MZUF 4097 (1 specimen), CASC 031757 (1 specimen).

Type locality: Somalia, Gesira , 01°58'N: 45°10'E, in the intertidal zone .

Material examined: MADAGASCAR: Lavanono, 25 specimens ( GP, BD), from 26.5 to 69 mm long (figured specimen 69 mm long) .

Distribution: The eastern coast of Africa, from 2°N (Gesira, Somalia), to 22°S (Inhambane Province, Mozambique), and Madagascar.

Suborder Acanthochitonina Bergenhayn, 1930 Family Cryptoplacidae H. & A. Adams, 1858 Genus Cryptoplax de Blainville, 1818 Cryptoplax: de Blainville 1818: 124 . Type species: Chiton larvaeformis de Blainville in Burrow, 1815, by subsequent designation ( Gray 1821: 234). For synonymy see Gowlett-Holmes (2001: 45). Distribution: Tropical and subtropical waters of the Indo-Pacific. Paleogene – Recent.

Figures

Fig.4.(A, B) Ischnochiton sirenkoi sp. n., Lavanono,Madagascar:(A) holotype MZB 45693, 12.2 ×6.1 mm; (B) a lot ofspecimens showing colour variations,length,from left to right, respectively 17.7,11.3, 11.2, 12, 10 and 9.5 mm; (C) Ischnochiton sansibarensis Thiele, 1909, holotype ZMB 102069, Zanzibar, ca 4 mm; (D–F) Callistochiton ashbyi (Barnard, 1963): (D) Lavanono, Madagascar, specimen n. 2 (Table 1), 23.3 mm; (E, F) holotype SAMC-A9337, an intermediate valve from Cape Infanta,SouthAfrica,dorsal and ventral views,9×3.3 mm; (G)Callistochiton madagassicus Thiele,1909, holotype MNHN,Madagascar,21×14 mm (from original description),some detached valves at left; (H) Chaetopleura chelazziana Ferreira, 1983, Lavanono, Madagascar, 47×31 mm; (I–X) Cryptoplax dupuisiAshby, 1931, Lavanono, Madagascar:(I–K) specimens with the girdle deprived of dorsal spicules on the first four valves; (I, J) adult specimen, 51×12.5mm; (K) the smallerspecimen,28.5×4 mm;(L) specimen with the girdle completely coveredof dorsal spicules, 44×10 mm; (M, N) detail of sculpture of valves i–ii, in situ; (O, P) tail valve, lateral and ventral views, length 6.8 mm; (Q–X) valves i–viii (same scale), width (plates, without apophyses), from left to right, 4.4 mm (i), 3.9 mm (ii), 1.45 mm (iii), 2.65 mm (iv), 1.45 mm (v), 1.45 mm (vi), 2.4 mm (vii), 2.75 mm (viii).